<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>固定定位小技巧-固定到版心右侧</title>
    <style>
      .w {
        width: 800px;
        height: 1400px;
        background-color: pink;
        margin: 0 auto;
      }
      .fixed {
        position: fixed;
        /* 1. 偏移浏览器宽度的一半 */
        left: 50%;
        /* 2. 利用margin属性，再移动版心盒子宽度的一半距离 */
        margin-left: 405px;
        width: 50px;
        height: 150px;
        background-color: skyblue;
      }
    </style>
  </head>
  <body>
    <div class="fixed"></div>
    <div class="w">版心盒子 800像素</div>
  </body>
</html>
